linux-kernel - i2c-i801 vs. ACPI driver to access SMBUS

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Message-ID: <53E202A6.3080002@digadd.de>
Date:	Wed, 06 Aug 2014 12:25:42 +0200
From:	Christian Schmidt <schmidt@...add.de>
To:	linux-kernel@...r.kernel.org
Subject: i2c-i801 vs. ACPI driver to access SMBUS

Hi all,

I have a small issue with the i2c-i801 driver. It does not register the
i2c adaptor due to an ACPI resource conflict:

[11074.459747] ACPI Warning: SystemIO range
0x000000000000f000-0x000000000000f01f conflicts with OpRegion
0x000000000000f000-0x000000000000f00f (\_SB_.PCI0.SBUS.SMBI)
(20140214/utaddress-258)
[11074.459761] ACPI: If an ACPI driver is available for this device, you
should use it instead of the native driver

With the code:
        err = acpi_check_resource_conflict(&dev->resource[SMBBAR]);
        if (err) {
                err = -ENODEV;
                goto exit;
        }

silently not activating the driver, however it still shows up in lspci
-k. Commenting out the above code makes the driver provide the smbus
interface as expected,

The question is: Is there any existing ACPI driver for this? I can't
find any either under ACPI or i2c (i2c-scmi does not work for this).

Regards,
Christian

PS: Please CC: me on replies as I am not subscribed to the list.
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